Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8bd1ff0cc6fe27f9…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3f21ff910a1ea5089eab49822f08c4f5 SHA-1: 83de8794ad3d611bed37657dbe72c21a2ded3548 SHA-256: 8bd1ff0cc6fe27f967ffdfcd3b6188c4e7520978a5756b1ed1afe383dd4cf405
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This Excel document contains VBA macros that reference PowerShell and cmd.exe. The VBA code itself appears to be heavily obfuscated, including a Base64 decoding function, suggesting an attempt to hide malicious activity. The presence of these elements strongly indicates the document is designed to download and execute a secondary payload.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ce82885b19de332e60dfa2f8d33664138ffe8e0dae549ff5d8b936a0644b9aee		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
7f1d5791a5fe09e252ab618ea90aa9c0bf890ff0e5368a9eca97d02d207bac5b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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